Core and Drilling Bits

Sometimes you just need to put a hole in the
glass! There are two ways to go about this. You can use
a drilling bit to make a hole or you can use a core bit to remove a
core of glass and leave a hole. The difference is that a drill
bit will create the hole size that it advertises, but the core bit
will create a circle of glass in the size that it advertizes.
The hole left in the glass from a core bit drilling will be slightly
larger than the core bit size. Both methods require it be
drilled with water!

GAI Drilling Speedbits

GAI speedbits have a carbide tip designed to drill
through hard surfaces. Not only do carbide tips last longer,
but it will keep your bit from "walking" as you begin to drill.
Works best in a standard drill and can drill in glass, granite,
marble, quartz, cermaic and porcelain tile. The size shown is the
size of the hole that tip will create. Be sure to use water
for lubrication.

Core drill bits have a hollow center and cut a circle in the material to create a hole. This results in a hole the size of the drill and a smaller "plug" or "core" which comes from the center. Just add water for lubrication. All diamond core drills have shaft sizes of 3/8" (10 mm) or less, for use in most standard drills and drill presses.